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Add CUDAHashMapImpl via cuCollections #391

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Jan 28, 2025
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Add CUDAHashMapImpl via cuCollections #391

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69 changes: 69 additions & 0 deletions pyg_lib/csrc/classes/cuda/hash_map_impl.cu
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Original file line number Diff line number Diff line change
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#include <ATen/ATen.h>
#include <cuco/static_map.cuh>

#include "../hash_map_impl.h"

namespace pyg {
namespace classes {

namespace {

template <typename KeyType>
struct CUDAHashMapImpl : HashMapImpl {
public:
using ValueType = int64_t;

CUDAHashMapImpl(const at::Tensor& key) {
KeyType constexpr empty_key_sentinel = -1; // TODO
ValueType constexpr empty_value_sentinel = -1;

map_ = std::make_unique<cuco::static_map<KeyType, ValueType>>(
2 * key.numel(), // loader_factor = 0.5
cuco::empty_key{empty_key_sentinel},
cuco::empty_value{empty_value_sentinel});

const auto options =
at::TensorOptions().device(key.device()).dtype(at::kLong);
const auto value = at::arange(key.numel(), options);
const auto key_data = key.data_ptr<KeyType>();
const auto value_data = value.data_ptr<ValueType>();

map_->insert(key_data, value_data, key.numel());
}

at::Tensor get(const at::Tensor& query) override {
const auto options =
at::TensorOptions().device(query.device()).dtype(at::kLong);
const auto out = at::empty({query.numel()}, options);
const auto query_data = query.data_ptr<KeyType>();
auto out_data = out.data_ptr<int64_t>();

map_->find(query_data, out_data, query.numel());

return out;
}

private:
std::unique_ptr<cuco::static_map<KeyType, ValueType>> map_;
};

// template struct CUDAHashMapImpl<bool>;
// template struct CUDAHashMapImpl<uint8_t>;
// template struct CUDAHashMapImpl<int8_t>;
// template struct CUDAHashMapImpl<int16_t>;
// template struct CUDAHashMapImpl<int32_t>;
// template struct CUDAHashMapImpl<int64_t>;
// template struct CUDAHashMapImpl<float>;
// template struct CUDAHashMapImpl<double>;

struct CUDAHashMap : torch::CustomClassHolder {
public:
CUDAHashMap(const at::Tensor& key) {}

at::Tensor get(const at::Tensor& query) { return query; }
};

} // namespace

} // namespace classes
} // namespace pyg
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